Retransmitter system and impulse corrector



Dec. 26, 1950 P. PELLE 2,535,754

RETRANSMITTER SYSTEM AND IMPULSE CORRECTOR Filed March 21, 1946 Y r t R1 6 1 Figure 1 c n E F Figure 2 QMUM M Patented Dec. 26, 1950 'RETRANSMITTER SYSTEM AND IMPULSE CORRECTOR Pierre Pell, Arcueil, France Application March 21, 1946, Serial No. 655,971 In France February 15, 1945 Section 1, Public Law 690, August 8, 1946 Patent expires February 15, 1965 My invention re ates to signal correctors for transmitting systems.

It is an object of my invention to provide a signal corrector which is simple in design and reliable in operation,

It is another object of my invention'to provide a signal corrector which operates with one single tube.

It is a further object of my invention to provide a signal corrector which operates with a v"cuum tube in contradis'tinction to known signal coranode, said anode being assoc ated with said windings of said second relay, an impulse generator connected'to said grid and biasing the same at regular time intervals shorter than the longest time interval of the uncorrected s gnal with relatively short impuls s rendering said tube conductive, said second relay having an armature connected to an output circuit and two spaced countercontacts connected, respectively, to opposite terminals of apower sup ly, whereby sa d armature of said second relay is moved over from one of said .countercontacts to the other whenever a winding of said second relay has been connected to the-source o'fHT potential by said armature of said first relay and said imnuse generator biases saidgr d so as to render said tube conductive.

In a preferred embodiment of my invent o the second relay is a polarized relay having serially connected windings.

Other objects of mv invention will be apparent from the following detailed descript on thereof in connection with the accompanying dr wings forming part of this snecifi'c'ation in whi h an embodiment of my invention is diagrammatically shown by way of example.

In the drawings:

Fig. 1 is circuit diagram of a signal corrector according to my invention, and

Fig. '2' s current-t me dia rams illustmting the operation of the device shown in Fig. 1.

Referring now tothe drawing, andfirst to Fig. 1, a relay R1 receiving the signals to be corrected 6 Claims. (Cl. 178-70) is shown having an armature m which is connected to the positive terminal of a source of HT potential the other terminal (not shown) of which is grounded. The armature a1 makes alternately contact with one or the other of contacts n and t1 connecting them to the source of HT potential according to the signal received by the relay R1.

To each of the contacts 11 and i1 is connected, respectively, one terminal of the two windings of a polarized relay R2, the other terminals of which are connected to each other so as to form a junction of the windings. Resistances 1" connect the armature a1 permanently to the contacts 11 and t1 so that the circuit through the windings of the polarized relay R2 is not interrupted by the changing over of armature 111. This is of importance because the anode a of a vacuum tube L is connected to the junction of the windings of the polarized relay R2 as more fully described hereinafter and remains permanently connected to the source of HT potential.

The polarized relay R2 is provided with an armature or which is connected to a grounded output circuit indicated by C in which the corrected signal is received as more fully described hereinafter. The armature a2 cooperates with two countercontacts T2 and t2 which are connected respectively, to the negative and positive terminal of a power source (not shown).

A vacuum tube L is provided with a grounded cathode, a grid 9 connected to a biasing device to be presently more fully described, and an anode a connected to the junction of the windings of the polarized relay R2. The grid g is connected to an impulse generator I which generates at regular time intervals relatively short impulses which render the tube L conductive whereas in the reatively long intervals between the impulses the tube L is nonconductive. The time intervals are shorter than the duration of the longest part. of the signal to be corrected.

The operation of this device is as follows:

The signals to be corrected are received by relay R1 which changes over its armature from contact n to contact 731 and back in a rhythm corresponding to the signals to be corrected. Fig. 2a shows the signal current produced in relay R1 plotted as ordinates" against the time as abscissa. At the time A the armature car makes contact with n and at the time B it changes over to contact 771, and so forth.

By the changing over of armature 0.1 the winding-s of polarized relay R2 are alternatively conre ted to the positive terminal of the source of HT potential in the rhythm of the signal to be which will happen at the time F in Fig. 20. will be understood that at the time E in Fig.

corrected shown in Fig. 2a. The relay Re, how-- ever, does not yet switch over its armature as long as the anode a of the tube L does not carry any current.

The tube L is rendered conductive by its grid 9 at regular intervals of time which are determined by the impulse generator I connected to the grid 9 and are shorter than the longest part of the signal to be corrected. The anode current of tube L is plotted against the time in the diagram of Fig. 2b which shows that the tube L is conductive at periodical intervals of time for a relatively short time only.

Suppose now that at the start of the signal to be corrected the armature a2 is in contact with countercontact 252. It remains in this position until tube L becomes conductive (at time C in Fig. 20) when armature a2 changes over to countercontact 1-2. It remains in contact with T2 even after tube L has become non-conductive and changes over only after armature on has changed over to IE1 and tube L has become conductive once more, which will happen in the embodiment shown in the drawing at the time D in Fig. 2c. Nowarmature a2 remains in contact withcountercontact 132 until armature (11 has changed over to contact 11 and the tube L becomes conductive, It

the armature a2 does not change over from countercontact is to countercontact r2 although the impulse generator renders tube L conductive at this moment, because armature a1 is still in contact with t1.

Thus it will be seen that the duration of the corrected signal is determined by the impulse generator I and is always equal to the period or a multiple thereof of the impulses generated by the generator I. The impulses alone, however, do not effect a change over of armature m for which a changing over of armature a; is a preliminary condition.

I claim:

1. In an impulse corrector for transmitting systems, a relay energized by the signal to be corrected, said relay being provided with two spaced contacts and with an armature movable between said two contacts for alternately engaging the same, means for connecting said armature to a source of high potential, a difierential polarized relay including two serially connected coils and a movable armature movable between two fixed contacts of said last named relay, a three-electrode tube having an anode and a grid, said anode being conductively connected to the point of connection between said serially connected coils of said difierential relay, the two .other ends of said coils being conductively connected respectively, to said two contacts of said first named relay, a local power supply for feeding current impulses to the grid of said tube thereby generating in said tube a current passing through said anode and the coils of the differ- Iential relay whose circuit is closed by said first named armature, said movable armature of said difierential relay and the two contacts associated therewith forming parts of an output circuit adapted to be alternately connected with the positive or negative pole of a power supply.

2. A signal corrector for transmitting systems comprising a first relay adapted to be energized -by the signal to be corrected, an armature and two spaced contacts forming part of said first relay, said armature of said first relay being movable between said contacts for alternately engaging the same and connecting the same to a source of HT potential, a second relay including two windings connected, respectively, to said spaced contacts, a vacuum tube having a grounded cathode, a grid and an anode, said anode being associated with said windings of said second relay, and an impulse generator connected to said grid and biasing the same at regular time intervals shorter than the duration of the longest part of the signals to be corrected with relatively short impulses rendering said tube conductive, said second relay having an armature connected to an output circuit and two spaced countercontacts connected, respectively, to opposite terminals of a power supply, whereby said armature of said second relay is moved from one of said countercontacts to the other whenever a winding of said second relay has been connected to the source of HT potential by said armature of said first relay and said impulse generator biases said grid so as to render said tube conductive.

3. A signal corrector for transmitting systems comprising a first relay adapted to be energized by the signal to be corrected, an armature and two spaced contacts forming part of said first relay, said armature of said first relay being moved between said contacts for alternately engaging the same and connecting the same to a source of HT potential, a second relay including two windings connected, respectively, to said spaced contacts, a vacuum triode having a. grounded cathode, a grid and an anode, said anode being associated with said windings of said second relay, and an impulse generator connected to said grid and biasing the same at regular time intervals shorter than the duration of the longest part of the signals to be corrected with relatively short impulses rendering said triode conductive, said second relay having an armature connected to an output circuit, and two spaced countercontacts connected, respectively, to opposite terminals of a power supply, whereby said armature of said second re'iay is moved from one of said countercontacts to the other whenever a winding of said second relay has been connected to the source of HT potential by said armature of said first reiay and said impulse generator biases said grid so as to render said triode conductive.

4. A signal corrector for transmitting systems comprising a first relay adapted to be energized by the signal to be corrected, an armature and two spaced contacts forming part of said first relay, said armature of said first relay being movable between said contacts for alternately engaging the same and connecting the same to a source of HT potential, a second relay including. two windings connected, respectively, to said spaced contacts, a vacuum tube having a grounded cathode, a grid and an anode, said anode being associated with said windings of said second relay, and an impulse generator connected to said grid and biasing the same at regular time intervals shorter than the duration of the longest part of the signals to be corrected with relatively short impulses rendering said tube conductive, said second relay having an armature connected to an output circuit and two spaced countercontacts corresponding, respectively, to said windings and connected, respectively, to opposite terminals of second relay has been connected to the source of HT potential by said armature of said first relay and said impulse generator biases said grid so as to render said tube conductive.

5. A signal corrector for transmitting systems comprising a first relay adapted to be energized by the signal to be corrected, an armature and two spaced contacts forming part of said first relay, said armature of said first relay being movable between said contacts for alternately engaging the same and connecting the same to a source of HT potential, a polarized relay including two serially connected windings connected, respectively, to said spaced contacts, a vacuum tube havin a grounded cathode, a grid and an anode, said anode being connected to the junction of said serially connected windings of said polarized relay, and an impulse generator connected to said grid and biasing the same at regular time intervals shorter than the duration of the longest part of the signals to be corrected with relatively short impulses rendering said tube conductive, said polarized relay having an armature connected to an output circuit and two spaced countercontacts connected, respectively, to opposite terminals of a power supply, whereby said armature of said polarized relay is moved from one of said countercontacts to the other whenever a winding of said polarized relay has been connected to the source of HT potential by said armature of said first relay and said impulse generator biases said grid so as to render said tube conductive.

6. A signal corrector for transmitting systems comprising a first relay adapted to be energized by the signal to be corrected, an armature and two spaced contacts forming part of said first relay, said armature of said first relay being movable between said contacts for alternately engaging the same and connecting the same to a source of ET potential, a polarized relay including two serially connected windings connected, respectively, to said spaced contacts, a vacuum tube having a grounded cathode, a grid and an anode, said anode being connected to the junction of said serially connected windings or said polarized relay, and an impulse generator connected to said grid and biasing the same at regular time intervals shorter than the duration of the longest part of the signals to be corrected with relatively short impulses rendering said tube conductive, said polarized relay having an armature connected to an output circuit and two spaced countercontacts corresponding, respectively, to said serially connected windings and connected, respectively, to opposite terminals of a power supply, whereby said armature of said polarized relay is moved from one of said countercontacts to the other whenever the winding corresponding to said other countercontact of said polarized relay has been connected to the source of potential by said armature of said first relay and said impulse generator biases said grid so as to render said tube conductive. v

PELLE, PIERRE.

Name Date McCann July 2, 1946 Number 

